Whether the OTU boards LW40 and LU40 in the BWS 1600G single-wavelength 40G system can be interconnected

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Question:
Can the OTU boards LW40 and LU40 in the BWS 1600G single-wavelength 40G system be interconnected?
Root cause:
None
Answer:
The LW40 and LU40 boards cannot be interconnected. The two types of boards use different UFEC algorithms because the chip vendors of the UFEC modules on the LW40 and LU40 boards are different.
If the LW40 and LU40 boards need to be interconnected, you must disable the UFEC function on the boards and enable the OTN-based FEC function, but the FEC capability will be degraded.

Other related questions:
Interconnection between LW40 and LU40 (40G OTU boards)
The UFEC modules in the LW40 and LU40 boards are provided by different vendors. As a result, the UFEC algorithms of the two boards are different and therefore the two boards cannot be interconnected. To implement interconnection between LW40 and LU40 boards, disable the UFEC function of the two boards and enable the standard FEC function of the OTN equipment. The FEC error correction capability, however, will be greatly reduced when the standard FEC function of OTN equipment is used.

Nominal single-wavelength input optical power for OA boards on BWS 1600G?
Suggestion: What is the nominal single-wavelength input optical power is determined for OA boards of the BWS 1600G? Answer: Strictly speaking, there is no definition of nominal single-wavelength optical power for OA boards. The optical power is determined as follows: To increase the signal-to-noise ratio, the incident optical power and receive optical power must reach the maximum as possible. A 400G OAU board is used as an example. The maximum incident optical power is 20 dBm and 40 wavelengths are supported. Therefore, the maximum single-wavelength output optical power is 4 dBm. The BA gain is 19 dB, and therefore the single-wavelength input optical power of the BA board is defined to -15 dBm. A VOA and DCM need to be added between PA and BA boards, the minimum VOA attenuation is 3 dB, and the maximum DCM attenuation is 12 dBm. Therefore, the minimum single-wavelength output optical power of the PA board is as follows: -15 + 12 + 3 = 0 (dBm). The C-band gain is 20 dB and the L-band gain is 19 dB, and therefore the maximum single-wavelength input optical power of the PA board is -19 dBm. The attenuation of the maximum span is 36 dB, and therefore the minimum single-wavelength input optical power of the PA board is as follows: 4 - 36 = 32 (dBm). Varying with span reaches, the single-wavelength input optical power of the PA board ranges from -32 dBm to -19 dBm. The gain of a PA board embedded with a Raman amplifier (OAU_R) is 10 dB, and therefore the single-wavelength input optical power is -9 dBm.

Wavelength scanning results of MCA boards on BWS 1600G
Generally, the SNR AFEC is around 15. If center wavelength deviation is detected, an alarm is generated.

Whether an SSE7LWFT01 board on a BWS 1600G supports wavelength tunable optical modules
In the board name, T indicates tunable wavelengths. The SSE7LWFT01 board supports wavelength tunable optical modules.

Whether the OHP2 board of BWS 1600G can be replaced by the OHP board of BWS 320G
The OHP2 board of BWS 1600G cannot be replaced by the OHP board of BWS 320G. BWS 320G also has 71OHP and 72OHP boards.

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